とうとう

adverb taking the 'to' particle, taru-adjective

torrentially; swiftly flowing; voluminously

Describes water, especially a river, flowing powerfully and abundantly. Often used in literary or descriptive contexts.

• 大おお雨あめで川かわがとうとうと流ながれている。

  The river is flowing torrentially due to the heavy rain.

adverb taking the 'to' particle, taru-adjective

eloquently; fluently; spouting forth

Used for speech that flows smoothly and abundantly, often with a sense of eloquence or unstoppable talk.

• 彼かれは自じ分ぶんの意い見けんをとうとうと述のべた。

  He stated his opinion eloquently and at length.

adverb taking the 'to' particle, taru-adjective

flood of the times; current of the times

Metaphorical use referring to a powerful, unidirectional trend or movement of an era. Rare and literary.

• 時じ代だいの流ながれがとうとうと進すすんでいく。

  The current of the times moves forward powerfully.